20022121021 has 8 divisors (see below), whose sum is σ = 22886645760. Its totient is φ = 17158651728.

The previous prime is 20022121019. The next prime is 20022121027. The reversal of 20022121021 is 12012122002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20022121021 - 2¹ = 20022121019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022120992 and 20022121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022121027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222781 + ... + 299458.

It is an arithmetic number, because the mean of its divisors is an integer number (2860830720).

Almost surely, 2^20022121021 is an apocalyptic number.

It is an amenable number.

20022121021 is a deficient number, since it is larger than the sum of its proper divisors (2864524739).

20022121021 is an equidigital number, since it uses as much as digits as its factorization.

20022121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527723.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20022121021 its reverse (12012122002), we get a palindrome (32034243023).

The spelling of 20022121021 in words is "twenty billion, twenty-two million, one hundred twenty-one thousand, twenty-one".